Identifying UNIX Users
The who command identifies current users who are logged on:
host% who
rbarrett pts/0 Apr 03 13:46 (spam.lanl.gov)
ahg pts/0 Apr 02 08:27 (penning.lanl.gov)
jbp pts/1 Apr 02 08:58 (telemachus.lanl.)
jimm pts/2 Apr 02 08:52 (ts800-1-tig.lanl)
operator pts/6 Apr 02 09:20 (ibm-op)
cadams pts/7 Apr 15 10:28 (maccda2.mst.lanl)